Tool-retainer for hammer-drills.



L. C. BAYLES.

TOUL HUMMER FOR HAMMER DRILLS.

APPUCATON FILED Mh 30. 1817.

Patented Sept. 18, 191?.

LEWis e. EAYLEs, or EASTON, PENNSYLVANIA, n ssIsNon To INGERSoLL-nnnncoMPnNY, or JERSEY CITY, NEW JERSEY, n COEPOEATIQN or NEW Jensen.

TOOL-RETAINER OR HAMMER-DRILLS.

mme-ie.

Specication of Letters Patent. ?aignted Sep-5;. 1g? 1911* Applicationfiled January 30, 1917. Serial N o. 145,410.

To all whom z't may concern:

lie it known that l, 'LEWIS C. BAYLES, a. citizen of the United States,residing at Eastomin the county of Northampton and State ofPennsylvania,T have invented a certain new and useful Improvement 1nTool- `Retainers for Hammer-Drills, of which the 'durable and convenientof manufacture, and

in which the supporting means for the ytool retainer are inclosed withinthe front head of thc hammer drill. y

-W'ith this and other objects in view my invention consists in thefeatures of construction and operation set forth in the' followingspecilication and claims and illustrated in the accompanying drawings.

in the drawings which are annexed hereto and form a part of thespecification,

Figure 1 is a longitudinal sectional view of the forward portion of ahammer drill with the tool retainer shown in position,

Fig. 2, a side elevation of the retainer and front head of the hammerdrill,

Fig. 3, a top plan View of my tool retainer, and Fig. 4, a frontelcvation'n the same.

The construction comprises a pneumatic or other tool body 1 in which a`piston 2 is adapted 'to reciprocate and strike; against the shank 3 ofa drill steel or other implement 3. The drill steel 3 is retained in a'chuck 4 contained in the front head 5 of the pneumatic tool and inwhich the chuck and drill are adapted to rotate. This is all a standardconstruction of hammer drill and forms no part of the present inventionwith the. exception of the front head', which is adapted to receiveparts of the drill steel retainer. y l

.Upon one side of the front head 5 is mounted a cylinder 6 whose axis isat a slight angle to the longitudinal axis of the front head 5,although, if desired,- the two axes may be made' parallel. Within thecylinder 6 a plunger 7 is adapted to slide against the pressure of acompressible spring 8, also contalled in the'cylinder 6 and which restsagainst the plunger 7, the forward motion of the plunger 7 being opposedby the compressible spring 8. Pivotally mounted upon the plunger 7, at9, are the side arms 10 of the tool. retaining yoke 11. The yoke 11 isshaped to embrace the drill steel 3 inA advance of the collar 12 mountedupon the` drill 3 when in the full-line position shown in the figures ofthe drawing, and permits thelatter to freely move forward until thecollar 12 engages the yoke 11.

The object of the resilient member between the yoke -11 and the fronthead 5 is to absorb the shock which would occur 'if the drill steel'isnot against the work at the time it is struck by the piston. This forcewould be so great that it would'break almost any form of rigidconnection which might be used to arrest its movement. lf desired, any

other form of resilient means may be inserted in place of thecompressible s ring 8, such, for instance, as a block of ruS-ber or evenair under line pressure may be admitted to the cylinder 6. l

On the outside of the cylinder 6 and located on each side thereof arelugs 13 which are provided with depressions 14 and 15 in which the sidearms 10 .are adapted to lodge. lVhen the side arms 10 are lodged in thedepressions 14e the yoke 11 will closely embrace the drill steel forabout one half its circumference and is in operative position to retainthe drill steel in the tool, but when the side arms are lodged in thedepressions 15 the yoke is far enough removed from the drill steel topermit the free passage of the collar 12 on the steel 3 and the yoke istherefore in an inoperative position to work as a drill steel retainer.The side members 1G, as shown clearly in Fig. 4, are shaped so that whenthe yoke and side members are in the position shown in dotted lines inFigs. 1 and 2 the opening between said side arms is ample for theremoval of the tool.

The yoke 11 and the side larms 10 are of spring steel or other suitablematerial, so that while shaped to rest in the depressions 14 and 15 theyhave enough elasticity to permit the side arms being forced over theridges separating the vdepressions 14 and 15 without permanentdistortion.

From the above it isl thought that the operation of this tool retainerwill be obvi-` ous, and it is to beunderstood that while the presentshowing and description discloses only one specilc embodiment of thepresent invention, other forms and modications are included within thespirit and scope of the same, as expressed in the claims.

What I claim is: 1. In a tool retainer of the class described, a tool, ayoke .for limiting the movementoi:l said tool, two side arms extendinghack from said yoke and pivotally engaging resilient means containedwithin the front head of the machine 'for resisting the forward movementof the yoke and side arms.

2. In a tool retainer of the class described, a tool having -a collar onits shank, a yoke Vmovable into and out of engagement with said collar,side arms extending back from said yoke and pivotally engaging aplunger, and resilient means contained jwithinvthe front head of themachine for resisting'the forward movement of the yoke, side arms andplunger.

3. In combination with a hammer drill having a front head, a collareddrill steel, a yoke adapted to engage said collar when said drill steelis forced forward, said yoke having two side arms extending back to andpivotally engaging resilient means within said front head to resist theforward move' ment of said yoke and side arms.

e. In a pneumatic tool having a front head, a cylinder mounted upon saidfront head, a plunger' slidable within said cylinder forwardv naadeeeconnecting said and side arms `pivotally drill steel plunger to a yokeembracing a inserted in said front head.

5. ln a pneumatic tool having a front head, a cylinder mounted upon saidfront head, a plunger slidable within said cylinder, lugs mounted on theoutside of said cylinder and side arms connecting said, plunger to ayokeembracing a drill steel inserted in said front head, said lugs retainingsaid side members and yoke in operative and inoperative position.

6, ln combination with a hammer drill, a drill steel retainer comprisinga yoke engaging said steel, side arms extending back from said yoke andpivotally engaging resilient means contained within the hammer drill forresisting thc forward movement of said yoke, and means for holding saidside arms in operative and inoperative position. f

'i'. In combination with a hammer drill, a drill steel retainercomprising a yoke engaging said steel, side arms, resilient meanscontained within the hammer drill for resisting the forward movement ofsaid yoke,

.and

means mounted on said hammer drill holding said side arms in operativeand inoperative position. y

in testimony whereof, have hereunto set my hand.

LEWIS C. BAYLES.

